/*
Copyright 2020-2021 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

@description Intel AMT IDER module
@author Ylian Saint-Hilaire
@version v0.3.0
*/

/*jslint node: true */
/*jshint node: true */
/*jshint strict:false */
/*jshint -W097 */
/*jshint esversion: 6 */
"use strict";

// Construct a Intel AMT IDER object
module.exports.CreateAmtRemoteIder = function (webserver, meshcentral) {
    const fs = require('fs');

    var obj = {};
    obj.protocol = 3; // IDER
    obj.bytesToAmt = 0;
    obj.bytesFromAmt = 0;
    obj.rx_timeout = 30000;     // Default 30000
    obj.tx_timeout = 0;         // Default 0
    obj.heartbeat = 20000;      // Default 20000
    obj.version = 1;
    obj.acc = null;
    obj.inSequence = 0;
    obj.outSequence = 0;
    obj.iderinfo = null;
    obj.enabled = false;
    obj.iderStart = 0; // OnReboot = 0, Graceful = 1, Now = 2
    obj.floppy = null;
    obj.cdrom = null;
    obj.floppyReady = false;
    obj.cdromReady = false;
    //obj.pingTimer = null;
    obj.sectorStats = null;
    obj.debug = false;

    // Private method
    function debug() { if (obj.debug) { console.log(...arguments); } }

    // Mode Sense
    var IDE_ModeSence_LS120Disk_Page_Array = Buffer.from([0x00, 0x26, 0x31, 0x80, 0x00, 0x00, 0x00, 0x00, 0x05, 0x1E, 0x10, 0xA9, 0x08, 0x20, 0x02, 0x00, 0x03, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xD0, 0x00, 0x00]);
    var IDE_ModeSence_3F_LS120_Array = Buffer.from([0x00, 0x5c, 0x24, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0a, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x16, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x05, 0x1E, 0x10, 0xA9, 0x08, 0x20, 0x02, 0x00, 0x03, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xD0, 0x00, 0x00, 0x08, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x06, 0x00, 0x00, 0x00, 0x11, 0x24, 0x31]);
    var IDE_ModeSence_FloppyDisk_Page_Array = Buffer.from([0x00, 0x26, 0x24, 0x80, 0x00, 0x00, 0x00, 0x00, 0x05, 0x1E, 0x04, 0xB0, 0x02, 0x12, 0x02, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xD0, 0x00, 0x00]);
    var IDE_ModeSence_3F_Floppy_Array = Buffer.from([0x00, 0x5c, 0x24, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0a, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x16, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x00, 0x00, 0x00, 0x05, 0x1e, 0x04, 0xb0, 0x02, 0x12, 0x02, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xd0, 0x00, 0x00, 0x08, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x06, 0x00, 0x00, 0x00, 0x11, 0x24, 0x31]);
    var IDE_ModeSence_CD_1A_Array = Buffer.from([0x00, 0x12, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    //var IDE_ModeSence_CD_1B_Array = Buffer.from([0x00, 0x12, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1B, 0x0A, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    var IDE_ModeSence_CD_1D_Array = Buffer.from([0x00, 0x12, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x1D, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    var IDE_ModeSence_CD_2A_Array = Buffer.from([0x00, 0x20, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x2a, 0x18, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    //var IDE_ModeSence_CD_01_Array = Buffer.from([0x00, 0x0E, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x06, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00]);
    var IDE_ModeSence_3F_CD_Array = Buffer.from([0x00, 0x28, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x06, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x2a, 0x18, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);

    // 0x46 constant data
    var IDE_CD_ConfigArrayHeader = Buffer.from([0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x08]);
    var IDE_CD_ConfigArrayProfileList = Buffer.from([0x00, 0x00, 0x03, 0x04, 0x00, 0x08, 0x01, 0x00]);
    var IDE_CD_ConfigArrayCore = Buffer.from([0x00, 0x01, 0x03, 0x04, 0x00, 0x00, 0x00, 0x02]);
    var IDE_CD_Morphing = Buffer.from([0x00, 0x02, 0x03, 0x04, 0x00, 0x00, 0x00, 0x00]);
    var IDE_CD_ConfigArrayRemovable = Buffer.from([0x00, 0x03, 0x03, 0x04, 0x29, 0x00, 0x00, 0x02]);
    var IDE_CD_ConfigArrayRandom = Buffer.from([0x00, 0x10, 0x01, 0x08, 0x00, 0x00, 0x08, 0x00, 0x00, 0x01, 0x00, 0x00]);
    var IDE_CD_Read = Buffer.from([0x00, 0x1E, 0x03, 0x00]);
    var IDE_CD_PowerManagement = Buffer.from([0x01, 0x00, 0x03, 0x00]);
    var IDE_CD_Timeout = Buffer.from([0x01, 0x05, 0x03, 0x00]);

    // 0x01 constant data
    var IDE_ModeSence_FloppyError_Recovery_Array = Buffer.from([0x00, 0x12, 0x24, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0A, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00]);
    var IDE_ModeSence_Ls120Error_Recovery_Array = Buffer.from([0x00, 0x12, 0x31, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0A, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00]);
    var IDE_ModeSence_CDError_Recovery_Array = Buffer.from([0x00, 0x0E, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x06, 0x00, 0xFF, 0x00, 0x00, 0x00, 0x00]);

    // CD info and performance
    var RD_CD_DiskInfo = Buffer.from([0x00, 0x20, 0x0e, 0x01, 0x01, 0x01, 0x01, 0x20, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    var RD_CD_Performance = Buffer.from([0x00, 0x00, 0x00, 0x04, 0x02, 0x00, 0x00, 0x00]);

    // Private method, called by parent when it change state
    obj.xxStateChange = function (newstate) {
        if (obj.debug) console.log("IDER-StateChange", newstate);
        if (newstate == 0) { obj.Stop(); }
        if (newstate == 3) { obj.Start(); }
    }

    obj.diskSetup = function (floppyPath, cdromPath) {
        debug(floppyPath, cdromPath);

        // Setup floppy
        if (floppyPath != null) {
            try {
                if (fs.existsSync(floppyPath) == false) { return 1; } // Floppy disk image does not exist
                var stats = fs.statSync(floppyPath);
                if ((stats.size % 512) != 0) { return 2; } // Invalid floppy disk image
                obj.floppy = { size: stats.size, ptr: fs.openSync(floppyPath, 'r') };
            } catch (ex) { return 3; } // Unable to open floppy disk image
        }

        // Setup CDROM
        if (cdromPath != null) {
            try {
                if (fs.existsSync(cdromPath) == false) { return 4; } // CDROM disk image does not exist
                var stats = fs.statSync(cdromPath);
                if ((stats.size % 512) != 0) { return 5; } // Invalid CDROM disk image
                obj.cdrom = { size: stats.size, ptr: fs.openSync(cdromPath, 'r') };
            } catch (ex) { return 6; } // Unable to open CDROM disk image
        }

        if ((obj.cdrom == null) && (obj.floppy == null)) { return 7; } // Can't do IDER with no disk images

        return 0;
    }

    obj.Start = function () {
        if (obj.debug) { console.log('IDER-Start'); console.log(obj.floppy, obj.cdrom); }
        obj.bytesToAmt = 0;
        obj.bytesFromAmt = 0;
        obj.inSequence = 0;
        obj.outSequence = 0;
        g_readQueue = [];

        // Send first command, OPEN_SESSION
        obj.SendCommand(0x40, Buffer.concat([ShortToStrX(obj.rx_timeout), ShortToStrX(obj.tx_timeout), ShortToStrX(obj.heartbeat), IntToStrX(obj.version)]));

        // Send sector stats
        if (obj.sectorStats) {
            obj.sectorStats(0, 0, obj.floppy ? (obj.floppy.size >> 9) : 0);
            obj.sectorStats(0, 1, obj.cdrom ? (obj.cdrom.size >> 11) : 0);
        }

        // Setup the ping timer
        //obj.pingTimer = setInterval(function () { obj.SendCommand(0x44); }, 5000);
    }

    obj.Stop = function () {
        if (obj.debug) console.log('IDER-Stop');
        //if (obj.pingTimer) { clearInterval(obj.pingTimer); obj.pingTimer = null; }
        obj.parent.Stop();
    }

    // Private method
    obj.ProcessData = function (data) {
        data = Buffer.from(data, 'binary');
        obj.bytesFromAmt += data.length;
        if (obj.acc == null) { obj.acc = data; } else { obj.acc = Buffer.concat([obj.acc, data]); }
        if (obj.debug) console.log('IDER-ProcessData', obj.acc.length, obj.acc.toString('hex'));

        // Process as many commands as possible
        while (obj.acc != null) {
            var len = obj.ProcessDataEx();
            if (len == 0) return;
            if (obj.inSequence != ReadIntX(obj.acc, 4)) {
                if (obj.debug) console.log('ERROR: Out of sequence', obj.inSequence, ReadIntX(obj.acc, 4));
                obj.Stop();
                return;
            }
            obj.inSequence++;
            if (len == obj.acc.length) { obj.acc = null; } else { obj.acc = obj.acc.slice(len); }
        }
    }

    // Private method
    obj.SendCommand = function (cmdid, data, completed, dma) {
        if (data == null) { data = Buffer.alloc(0); }
        var attributes = ((cmdid > 50) && (completed == true)) ? 2 : 0;
        if (dma) { attributes += 1; }
        var x = Buffer.concat([Buffer.from([cmdid, 0, 0, attributes]), IntToStrX(obj.outSequence++), data]);
        obj.parent.xxSend(x);
        obj.bytesToAmt += x.length;
        //if (cmdid != 0x4B) { console.log('IDER-SendData', x.length, x.toString('hex')); }
    }

    // CommandEndResponse (SCSI_SENSE)
    obj.SendCommandEndResponse = function (error, sense, device, asc, asq) {
        if (error) { obj.SendCommand(0x51, Buffer.from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xc5, 0, 3, 0, 0, 0, device, 0x50, 0, 0, 0]), true); }
        else { obj.SendCommand(0x51, Buffer.from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x87, (sense << 4), 3, 0, 0, 0, device, 0x51, sense, asc, asq]), true); }
    }

    // DataToHost (SCSI_READ)
    obj.SendDataToHost = function (device, completed, data, dma) {
        var dmalen = (dma) ? 0 : data.length;
        if (completed == true) {
            obj.SendCommand(0x54, Buffer.concat([Buffer.from([0, (data.length & 0xff), (data.length >> 8), 0, dma ? 0xb4 : 0xb5, 0, 2, 0, (dmalen & 0xff), (dmalen >> 8), device, 0x58, 0x85, 0, 3, 0, 0, 0, device, 0x50, 0, 0, 0, 0, 0, 0]), data]), completed, dma);
        } else {
            obj.SendCommand(0x54, Buffer.concat([Buffer.from([0, (data.length & 0xff), (data.length >> 8), 0, dma ? 0xb4 : 0xb5, 0, 2, 0, (dmalen & 0xff), (dmalen >> 8), device, 0x58, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), data]), completed, dma);
        }
    }

    // GetDataFromHost (SCSI_CHUNK)
    obj.SendGetDataFromHost = function (device, chunksize) {
        obj.SendCommand(0x52, Buffer.from([0, (chunksize & 0xff), (chunksize >> 8), 0, 0xb5, 0, 0, 0, (chunksize & 0xff), (chunksize >> 8), device, 0x58, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), false);
    }

    // DisableEnableFeatures (STATUS_DATA)
    // If type is REGS_TOGGLE (3), 4 bytes of data must be provided.
    obj.SendDisableEnableFeatures = function (type, data) { if (data == null) { data = ''; } obj.SendCommand(0x48, Buffer.concat([Buffer.from([type]), data])); }

    // Private method
    obj.ProcessDataEx = function () {
        if (obj.acc.length < 8) return 0;

        // First 8 bytes are the header
        // CommandID + 0x000000 + Sequence Number
        //console.log('ProcessDataEx', obj.acc[0], obj.acc);

        switch (obj.acc[0]) {
            case 0x41: // OPEN_SESSION
                if (obj.acc.length < 30) return 0;
                var len = obj.acc[29];
                if (obj.acc.length < (30 + len)) return 0;
                obj.iderinfo = {};
                obj.iderinfo.major = obj.acc[8];
                obj.iderinfo.minor = obj.acc[9];
                obj.iderinfo.fwmajor = obj.acc[10];
                obj.iderinfo.fwminor = obj.acc[11];
                obj.iderinfo.readbfr = ReadShortX(obj.acc, 16);
                obj.iderinfo.writebfr = ReadShortX(obj.acc, 18);
                obj.iderinfo.proto = obj.acc[21];
                obj.iderinfo.iana = ReadIntX(obj.acc, 25);
                if (obj.debug) console.log(obj.iderinfo);

                if (obj.iderinfo.proto != 0) {
                    if (obj.debug) console.log("Unknown proto", obj.iderinfo.proto);
                    obj.Stop();
                }
                if (obj.iderinfo.readbfr > 8192) {
                    if (obj.debug) console.log("Illegal read buffer size", obj.iderinfo.readbfr);
                    obj.Stop();
                }
                if (obj.iderinfo.writebfr > 8192) {
                    if (obj.debug) console.log("Illegal write buffer size", obj.iderinfo.writebfr);
                    obj.Stop();
                }

                if (obj.iderStart == 0) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x08)); } // OnReboot
                else if (obj.iderStart == 1) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x10)); } // Graceful
                else if (obj.iderStart == 2) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x18)); } // Now
                //obj.SendDisableEnableFeatures(1); // GetSupportedFeatures
                return 30 + len;
            case 0x43: // CLOSE
                if (obj.debug) console.log('CLOSE');
                obj.Stop();
                return 8;
            case 0x44: // KEEPALIVEPING
                obj.SendCommand(0x45); // Send PONG back
                return 8;
            case 0x45: // KEEPALIVEPONG
                if (obj.debug) console.log('PONG');
                return 8;
            case 0x46: // RESETOCCURED
                if (obj.acc.length < 9) return 0;
                var resetMask = obj.acc[8];
                if (g_media === null) {
                    // No operations are pending
                    obj.SendCommand(0x47); // Send ResetOccuredResponse
                    if (obj.debug) console.log('RESETOCCURED1', resetMask);
                } else {
                    // Operations are being done, sent the reset once completed.
                    g_reset = true;
                    if (obj.debug) console.log('RESETOCCURED2', resetMask);
                }
                return 9;
            case 0x49: // STATUS_DATA - DisableEnableFeaturesReply
                if (obj.acc.length < 13) return 0;
                var type = obj.acc[8];
                var value = ReadIntX(obj.acc, 9);
                if (obj.debug) console.log('STATUS_DATA', type, value);
                switch (type) {
                    case 1: // REGS_AVAIL
                        if (value & 1) {
                            if (obj.iderStart == 0) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x08)); } // OnReboot
                            else if (obj.iderStart == 1) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x10)); } // Graceful
                            else if (obj.iderStart == 2) { obj.SendDisableEnableFeatures(3, IntToStrX(0x01 + 0x18)); } // Now
                        }
                        break;
                    case 2: // REGS_STATUS
                        obj.enabled = (value & 2) ? true : false;
                        if (obj.debug) console.log("IDER Status: " + obj.enabled);
                        break;
                    case 3: // REGS_TOGGLE
                        if (value != 1) {
                            if (obj.debug) console.log("Register toggle failure");
                        } //else { obj.SendDisableEnableFeatures(2); }
                        break;
                }
                return 13;
            case 0x4A: // ERROR OCCURED
                if (obj.acc.length < 11) return 0;
                if (obj.debug) console.log('IDER: ABORT', obj.acc[8]);
                //obj.Stop();
                return 11;
            case 0x4B: // HEARTBEAT
                //console.log('HEARTBEAT');
                return 8;
            case 0x50: // COMMAND WRITTEN
                if (obj.acc.length < 28) return 0;
                var device = (obj.acc[14] & 0x10) ? 0xB0 : 0xA0;
                var deviceFlags = obj.acc[14];
                var cdb = obj.acc.slice(16, 28);
                var featureRegister = obj.acc[9];
                if (obj.debug) console.log('SCSI_CMD', device, cdb.toString('hex'), featureRegister, deviceFlags);
                handleSCSI(device, cdb, featureRegister, deviceFlags);
                return 28;
            case 0x53: // DATA FROM HOST
                if (obj.acc.length < 14) return 0;
                var len = ReadShortX(obj.acc, 9);
                if (obj.acc.length < (14 + len)) return 0;
                if (obj.debug) console.log('SCSI_WRITE, len = ' + (14 + len));
                obj.SendCommand(0x51, Buffer.from([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87, 0x70, 0x03, 0x00, 0x00, 0x00, 0xa0, 0x51, 0x07, 0x27, 0x00]), true);
                return 14 + len;
            default:
                if (obj.debug) console.log('Unknown IDER command', obj.acc[0]);
                obj.Stop();
                break;
        }
        return 0;
    }

    function handleSCSI(dev, cdb, featureRegister, deviceFlags) {
        var lba;
        var len;

        switch (cdb[0]) {
            case 0x00: // TEST_UNIT_READY:
                if (obj.debug) console.log("SCSI: TEST_UNIT_READY", dev);
                switch (dev) {
                    case 0xA0: // DEV_FLOPPY
                        if (obj.floppy == null) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                        if (obj.floppyReady == false) { obj.floppyReady = true; obj.SendCommandEndResponse(1, 0x06, dev, 0x28, 0x00); return -1; } // Switch to ready
                        break;
                    case 0xB0: // DEV_CDDVD
                        if (obj.cdrom == null) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                        if (obj.cdromReady == false) { obj.cdromReady = true; obj.SendCommandEndResponse(1, 0x06, dev, 0x28, 0x00); return -1; } // Switch to ready
                        break;
                    default:
                        if (obj.debug) console.log("SCSI Internal error 3", dev);
                        return -1;
                }
                obj.SendCommandEndResponse(1, 0x00, dev, 0x00, 0x00); // Indicate ready
                break;
            case 0x08: // READ_6
                lba = ((cdb[1] & 0x1f) << 16) + (cdb[2] << 8) + cdb[3];
                len = cdb[4];
                if (len == 0) { len = 256; }
                if (obj.debug) console.log("SCSI: READ_6", dev, lba, len);
                sendDiskData(dev, lba, len, featureRegister);
                break;
            case 0x0a: // WRITE_6
                lba = ((cdb[1] & 0x1f) << 16) + (cdb[2] << 8) + cdb[3];
                len = cdb[4];
                if (len == 0) { len = 256; }
                if (obj.debug) console.log("SCSI: WRITE_6", dev, lba, len);
                obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); // Write is not supported, remote no medium.
                return -1;
            /*
        case 0x15: // MODE_SELECT_6:
            console.log("SCSI ERROR: MODE_SELECT_6", dev);
            obj.SendCommandEndResponse(1, 0x05, dev, 0x20, 0x00);
            return -1;
            */
            case 0x1a: // MODE_SENSE_6
                if (obj.debug) console.log("SCSI: MODE_SENSE_6", dev);
                if ((cdb[2] == 0x3f) && (cdb[3] == 0x00)) {
                    var a = 0, b = 0;
                    switch (dev) {
                        case 0xA0: // DEV_FLOPPY
                            if (obj.floppy == null) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                            a = 0x00;
                            b = 0x80; // Read only = 0x80, Read write = 0x00
                            break;
                        case 0xB0: // DEV_CDDVD
                            if (obj.cdrom == null) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                            a = 0x05;
                            b = 0x80;
                            break;
                        default:
                            if (obj.debug) console.log("SCSI Internal error 6", dev);
                            return -1;
                    }
                    obj.SendDataToHost(dev, true, Buffer.from([0, a, b, 0]), featureRegister & 1);
                    return;
                }
                obj.SendCommandEndResponse(1, 0x05, dev, 0x24, 0x00);
                break;
            case 0x1b: // START_STOP (Called when you eject the CDROM)
                //var immediate = cdb[1] & 0x01;
                //var loej = cdb[4] & 0x02;
                //var start = cdb[4] & 0x01;
                obj.SendCommandEndResponse(1, 0, dev);
                break;
            case 0x1e: // LOCK_UNLOCK - ALLOW_MEDIUM_REMOVAL
                if (obj.debug) console.log("SCSI: ALLOW_MEDIUM_REMOVAL", dev);
                if ((dev == 0xA0) && (obj.floppy == null)) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                if ((dev == 0xB0) && (obj.cdrom == null)) { obj.SendCommandEndResponse(1, 0x02, dev, 0x3a, 0x00); return -1; }
                obj.SendCommandEndResponse(1, 0x00, dev, 0x00, 0x00);
                break;
            case 0x23: // READ_FORMAT_CAPACITIES (Floppy only)
                if (obj.debug) console.log("SCSI: READ_FORMAT_CAPACITIES", dev);
                var buflen = ReadShort(cdb, 7);
                var mediaStatus = 0, sectors;
                var mcSize = buflen / 8; // Capacity descriptor size is 8

                switch (dev) {
                    case 0xA0: // DEV_FLOPPY
                        if ((obj.floppy == null) || (obj.floppy.size == 0)) { obj.SendCommandEndResponse(0, 0x05, dev, 0x24, 0x00); return -1; }
                        sectors = (obj.floppy.size >> 9) - 1;
                        break;
                    case 0xB0: // DEV_CDDVD
                        if ((obj.cdrom == null) || (obj.cdrom.size == 0)) { obj.SendCommandEndResponse(0, 0x05, dev, 0x24, 0x00); return -1; }
                        sectors = (obj.cdrom.size >> 11) - 1; // Number 2048 byte blocks
                        break;
                    default:
                        if (obj.debug) console.log("SCSI Internal error 4", dev);
                        return -1;
                }

                obj.SendDataToHost(dev, true, Buffer.concat([IntToStr(8), Buffer.from([0x00, 0x00, 0x0b, 0x40, 0x02, 0x00, 0x02, 0x00])]), featureRegister & 1);
                break;
            case 0x25: // READ_CAPACITY
                if (obj.debug) console.log("SCSI: READ_CAPACITY", dev);
                var len = 0;
                switch (dev) {
                    case 0xA0: // DEV_FLOPPY
                        if ((obj.floppy == null) || (obj.floppy.size == 0)) { obj.SendCommandEndResponse(0, 0x02, dev, 0x3a, 0x00); return -1; }
                        if (obj.floppy != null) { len = (obj.floppy.size >> 9) - 1; }
                        if (obj.debug) console.log('DEV_FLOPPY', len); // Number 512 byte blocks
                        break;
                    case 0xB0: // DEV_CDDVD
                        if ((obj.cdrom == null) || (obj.cdrom.size == 0)) { obj.SendCommandEndResponse(0, 0x02, dev, 0x3a, 0x00); return -1; }
                        if (obj.cdrom != null) { len = (obj.cdrom.size >> 11) - 1; } // Number 2048 byte blocks
                        if (obj.debug) console.log('DEV_CDDVD', len);
                        break;
                    default:
                        if (obj.debug) console.log("SCSI Internal error 4", dev);
                        return -1;
                }
                //if (dev == 0xA0) { dev = 0x00; } else { dev = 0x10; } // Weird but seems to work.
                if (obj.debug) console.log("SCSI: READ_CAPACITY2", dev, deviceFlags);
                obj.SendDataToHost(deviceFlags, true, Buffer.concat([IntToStr(len), Buffer.from([0, 0, ((dev == 0xB0) ? 0x08 : 0x02), 0])]), featureRegister & 1);
                break;
            case 0x28: // READ_10
                lba = ReadInt(cdb, 2);
                len = ReadShort(cdb, 7);
                if (obj.debug) console.log("SCSI: READ_10", dev, lba, len);
                sendDiskData(dev, lba, len, featureRegister);
                break;
            case 0x2a: // WRITE_10 (Floppy only)
            case 0x2e: // WRITE_AND_VERIFY (Floppy only)
                lba = ReadInt(cdb, 2);
                len = ReadShort(cdb, 7);
                if (obj.debug) console.log("SCSI: WRITE_10", dev, lba, len);
                obj.SendGetDataFromHost(dev, 512 * len); // Floppy writes only, accept sectors of 512 bytes
                break;
            case 0x43: // READ_TOC (CD Audio only)
                var buflen = ReadShort(cdb, 7);
                var msf = cdb[1] & 0x02;
                var format = cdb[2] & 0x07;
                if (format == 0) { format = cdb[9] >> 6; }
                if (obj.debug) console.log("SCSI: READ_TOC, dev=" + dev + ", buflen=" + buflen + ", msf=" + msf + ", format=" + format);

                switch (dev) {
                    case 0xA0: // DEV_FLOPPY
                        obj.SendCommandEndResponse(1, 0x05, dev, 0x20, 0x00); // Not implemented
                        return -1;
                    case 0xB0: // DEV_CDDVD
                        // NOP
                        break;
                    default:
                        if (obj.debug) console.log("SCSI Internal error 9", dev);
                        return -1;
                }

                if (format == 1) { obj.SendDataToHost(dev, true, Buffer.from([0x00, 0x0a, 0x01, 0x01, 0x00, 0x14, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00]), featureRegister & 1); }
                else if (format == 0) {
                    if (msf) {
                        obj.SendDataToHost(dev, true, Buffer.from([0x00, 0x12, 0x01, 0x01, 0x00, 0x14, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x14, 0xaa, 0x00, 0x00, 0x00, 0x34, 0x13]), featureRegister & 1);
                    } else {
                        obj.SendDataToHost(dev, true, Buffer.from([0x00, 0x12, 0x01, 0x01, 0x00, 0x14, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0xaa, 0x00, 0x00, 0x00, 0x00, 0x00]), featureRegister & 1);
                    }
                }
                break;
            case 0x46: // GET_CONFIGURATION
                var sendall = (cdb[1] != 2);
                var firstcode = ReadShort(cdb, 2);
                var buflen = ReadShort(cdb, 7);

                if (obj.debug) console.log("SCSI: GET_CONFIGURATION", dev, sendall, firstcode, buflen);
                if (buflen == 0) { obj.SendDataToHost(dev, true, Buffer.concat([IntToStr(0x003c), IntToStr(0x0008)]), featureRegister & 1); return -1; } // TODO: Fixed this return, it's not correct.

                // Set the header
                var r = null;

                // Add the data
                if (firstcode == 0) { r = IDE_CD_ConfigArrayProfileList; }
                if ((firstcode == 0x1) || (sendall && (firstcode < 0x1))) { r = IDE_CD_ConfigArrayCore; }
                if ((firstcode == 0x2) || (sendall && (firstcode < 0x2))) { r = IDE_CD_Morphing; }
                if ((firstcode == 0x3) || (sendall && (firstcode < 0x3))) { r = IDE_CD_ConfigArrayRemovable; }
                if ((firstcode == 0x10) || (sendall && (firstcode < 0x10))) { r = IDE_CD_ConfigArrayRandom; }
                if ((firstcode == 0x1E) || (sendall && (firstcode < 0x1E))) { r = IDE_CD_Read; }
                if ((firstcode == 0x100) || (sendall && (firstcode < 0x100))) { r = IDE_CD_PowerManagement; }
                if ((firstcode == 0x105) || (sendall && (firstcode < 0x105))) { r = IDE_CD_Timeout; }

                if (r == null) {
                    //console.log('NOT RIGHT', sendall, firstcode, cdb[2], cdb[3]);
                    //process.exit(0);
                    r = Buffer.concat([IntToStr(0x0008), IntToStr(4)]);
                } else {
                    r = Buffer.concat([IntToStr(0x0008), IntToStr(r.length + 4), r]);
                }

                // Cut the length to buflen if needed
                if (r.length > buflen) { r = r.slice(0, buflen); }

                obj.SendDataToHost(dev, true, r, featureRegister & 1);
                return -1;
            case 0x4a: // GET_EV_STATUS - GET_EVENT_STATUS_NOTIFICATION
                //var buflen = (cdb[7] << 8) + cdb[8];
                //if (buflen == 0) { obj.SendDataToHost(dev, true, Buffer.concat([IntToStr(0x003c), IntToStr(0x0008)]), featureRegister & 1); return -1; } // TODO: Fixed this return, it's not correct.
                if (obj.debug) console.log("SCSI: GET_EVENT_STATUS_NOTIFICATION", dev, cdb[1], cdb[4], cdb[9]);
                if ((cdb[1] != 0x01) && (cdb[4] != 0x10)) {
                    if (obj.debug) console.log('SCSI ERROR');
                    obj.SendCommandEndResponse(1, 0x05, dev, 0x26, 0x01);
                    break;
                }
                var present = 0x00;
                if ((dev == 0xA0) && (obj.floppy != null)) { present = 0x02; }
                else if ((dev == 0xB0) && (obj.cdrom != null)) { present = 0x02; }
                obj.SendDataToHost(dev, true, Buffer.from([0x00, present, 0x80, 0x00]), featureRegister & 1); // This is the original version, 4 bytes long
                break;
            case 0x4c:
                obj.SendCommand(0x51, Buffer.concat([IntToStrX(0), IntToStrX(0), IntToStrX(0), Buffer.from([0x87, 0x50, 0x03, 0x00, 0x00, 0x00, 0xb0, 0x51, 0x05, 0x20, 0x00])]), true);
                break;
            case 0x51: // READ_DISC_INFO
                if (obj.debug) console.log("SCSI READ_DISC_INFO", dev);
                obj.SendCommandEndResponse(0, 0x05, dev, 0x20, 0x00); // Correct
                return -1;
            case 0x55: // MODE_SELECT_10:
                if (obj.debug) console.log("SCSI ERROR: MODE_SELECT_10", dev);
                obj.SendCommandEndResponse(1, 0x05, dev, 0x20, 0x00);
                return -1;
            case 0x5a: // MODE_SENSE_10
                if (obj.debug) console.log("SCSI: MODE_SENSE_10", dev, cdb[2] & 0x3f);
                var buflen = ReadShort(cdb, 7);
                //var pc = cdb[2] & 0xc0;
                var r = null;

                if (buflen == 0) { obj.SendDataToHost(dev, true, Buffer.concat([IntToStr(0x003c), IntToStr(0x0008)]), featureRegister & 1); return -1; } // TODO: Fixed this return, it's not correct.

                // 1.44 mb floppy or LS120 (sectorCount == 0x3c300)
                var sectorCount = 0;
                if (dev == 0xA0) {
                    if (obj.floppy != null) { sectorCount = (obj.floppy.size >> 9); }
                } else {
                    if (obj.cdrom != null) { sectorCount = (obj.cdrom.size >> 11); }
                }

                switch (cdb[2] & 0x3f) {
                    case 0x01: if (dev == 0xA0) { r = (sectorCount <= 0xb40) ? IDE_ModeSence_FloppyError_Recovery_Array : IDE_ModeSence_Ls120Error_Recovery_Array; } else { r = IDE_ModeSence_CDError_Recovery_Array; } break;
                    case 0x05: if (dev == 0xA0) { r = (sectorCount <= 0xb40) ? IDE_ModeSence_FloppyDisk_Page_Array : IDE_ModeSence_LS120Disk_Page_Array; } break;
                    case 0x3f: if (dev == 0xA0) { r = (sectorCount <= 0xb40) ? IDE_ModeSence_3F_Floppy_Array : IDE_ModeSence_3F_LS120_Array; } else { r = IDE_ModeSence_3F_CD_Array; } break;
                    case 0x1A: if (dev == 0xB0) { r = IDE_ModeSence_CD_1A_Array; } break;
                    case 0x1D: if (dev == 0xB0) { r = IDE_ModeSence_CD_1D_Array; } break;
                    case 0x2A: if (dev == 0xB0) { r = IDE_ModeSence_CD_2A_Array; } break;
                }

                if (r == null) {
                    obj.SendCommandEndResponse(0, 0x05, dev, 0x20, 0x00); // TODO: Send proper error!!!
                } else {
                    // Set disk to read only (we don't support write).
                    //ms_data[3] = ms_data[3] | 0x80;
                    obj.SendDataToHost(dev, true, r, featureRegister & 1);
                }
                break;
            case 0x51: // READ_DISK_INFORMATION
                obj.SendDataToHost(dev, true, RD_CD_DiskInfo, featureRegister & 1);
                break;
            case 0xAC: // GET_PERFORMANCE
                obj.SendDataToHost(dev, true, RD_CD_Performance, featureRegister & 1);
                break;
            default: // UNKNOWN COMMAND
                if (obj.debug) console.log("IDER: Unknown SCSI command", cdb[0]);
                obj.SendCommandEndResponse(0, 0x05, dev, 0x20, 0x00);
                return -1;
        }
        return 0;
    }

    function sendDiskData(dev, lba, len, featureRegister) {
        var media = null;
        var mediaBlocks = 0;
        if (dev == 0xA0) { media = obj.floppy; if (obj.floppy != null) { mediaBlocks = (obj.floppy.size >> 9); } }
        if (dev == 0xB0) { media = obj.cdrom; if (obj.cdrom != null) { mediaBlocks = (obj.cdrom.size >> 11); } }
        if ((len < 0) || (lba + len > mediaBlocks)) { obj.SendCommandEndResponse(1, 0x05, dev, 0x21, 0x00); return 0; }
        if (len == 0) { obj.SendCommandEndResponse(1, 0x00, dev, 0x00, 0x00); return 0; }
        if (media != null) {
            // Send sector stats
            if (obj.sectorStats) { obj.sectorStats(1, (dev == 0xA0) ? 0 : 1, mediaBlocks, lba, len); }
            if (dev == 0xA0) { lba <<= 9; len <<= 9; } else { lba <<= 11; len <<= 11; }
            if (g_media !== null) {
                // Queue read operation
                g_readQueue.push({ media: media, dev: dev, lba: lba, len: len, fr: featureRegister });
            } else {
                // obj.iderinfo.readbfr // TODO: MaxRead
                g_media = media;
                g_dev = dev;
                g_lba = lba;
                g_len = len;
                sendDiskDataEx(featureRegister);
            }
        }
    }

    var g_readQueue = [], g_dev, g_lba, g_len, g_media = null, g_reset = false;
    function sendDiskDataEx(featureRegister) {
        var len = g_len, lba = g_lba;
        if (g_len > obj.iderinfo.readbfr) { len = obj.iderinfo.readbfr; }
        g_len -= len;
        g_lba += len;

        var buffer = Buffer.alloc(len);
        fs.read(g_media.ptr, buffer, 0, len, lba, function (error, bytesRead, buffer) {
            obj.SendDataToHost(g_dev, (g_len == 0), buffer, featureRegister & 1);
            if ((g_len > 0) && (g_reset == false)) {
                sendDiskDataEx(featureRegister);
            } else {
                g_media = null;
                if (g_reset) { obj.SendCommand(0x47); g_readQueue = []; g_reset = false; } // Send ResetOccuredResponse
                else if (g_readQueue.length > 0) { var op = g_readQueue.shift(); g_media = op.media; g_dev = op.dev; g_lba = op.lba; g_len = op.len; sendDiskDataEx(op.fr); } // Un-queue read operation
            }
        });
    }

    return obj;
}

function ShortToStr(v) { return Buffer.from([(v >> 8) & 0xFF, v & 0xFF]); }
function ShortToStrX(v) { return Buffer.from([v & 0xFF, (v >> 8) & 0xFF]); }
function IntToStr(v) { return Buffer.from([(v >> 24) & 0xFF, (v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF]); }
function IntToStrX(v) { return Buffer.from([v & 0xFF, (v >> 8) & 0xFF, (v >> 16) & 0xFF, (v >> 24) & 0xFF]); }
function ReadShort(v, p) { return (v[p] << 8) + v[p + 1]; }
function ReadShortX(v, p) { return (v[p + 1] << 8) + v[p]; }
function ReadInt(v, p) { return (v[p] * 0x1000000) + (v[p + 1] << 16) + (v[p + 2] << 8) + v[p + 3]; } // We use "*0x1000000" instead of "<<24" because the shift converts the number to signed int32.
function ReadSInt(v, p) { return (v[p] << 24) + (v[p + 1] << 16) + (v[p + 2] << 8) + v[p + 3]; }
function ReadIntX(v, p) { return (v[p + 3] * 0x1000000) + (v[p + 2] << 16) + (v[p + 1] << 8) + v[p]; }